66554636 has 12 divisors (see below), whose sum is σ = 116664912. Its totient is φ = 33221808.

The previous prime is 66554633. The next prime is 66554639. The reversal of 66554636 is 63645566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66554633) and next prime (66554639).

It is a junction number, because it is equal to n+sod(n) for n = 66554593 and 66554602.

It is not an unprimeable number, because it can be changed into a prime (66554633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11120 + ... + 16023.

It is an arithmetic number, because the mean of its divisors is an integer number (9722076).

Almost surely, 2^66554636 is an apocalyptic number.

It is an amenable number.

66554636 is a deficient number, since it is larger than the sum of its proper divisors (50110276).

66554636 is a wasteful number, since it uses less digits than its factorization.

66554636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27760 (or 27758 counting only the distinct ones).

The product of its digits is 388800, while the sum is 41.

The square root of 66554636 is about 8158.1024754535. The cubic root of 66554636 is about 405.2528746430.

The spelling of 66554636 in words is "sixty-six million, five hundred fifty-four thousand, six hundred thirty-six".